1 AU equals about how many kilometers?

1 AU equals about how many kilometers?

• A. 100 million kilometers
• B. 1 billion kilometers
• C. 150 million kilometers
• D. 300 million kilometers

Answer: (C)

Distances inside our solar system are often expressed using astronomical units. One astronomical unit is the average distance from the Earth to the Sun, which is about 149.6 million kilometers. That makes the best estimate roughly 150 million kilometers. The other options don’t match this distance: 100 million is too small, 1 billion is far too large, and 300 million is about twice the average Earth–Sun distance. So 150 million kilometers is the correct approximation.

Distances inside our solar system are often expressed using astronomical units. One astronomical unit is the average distance from the Earth to the Sun, which is about 149.6 million kilometers. That makes the best estimate roughly 150 million kilometers. The other options don’t match this distance: 100 million is too small, 1 billion is far too large, and 300 million is about twice the average Earth–Sun distance. So 150 million kilometers is the correct approximation.